# What about more complicated molecules?

How about a mole of water? You know that the formula for water is H_{2}O. So, if you broke
all the bonds, a mole of water would actually contain TWO moles of hydrogen and ONE mole of oxygen.

You can then use the periodic table to determine how much each of those weighs:

total weight = 2 x Hydrogen + 1 x Oxygen

total weight = 2 x 1.008g + 1 x 15.99g

total weight = 18.006g

So a mol of water is about one swallow.

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